Actually this could probably be done quite easily by spawning a few ship entities with lots of flashers on the night side of a planet; it's was somewhere near the bottom of my to-do list a while ago but must have fallen off.. Unfortunately I'm rather busy right now trying to make an improved replacement for CustomShields and otherwise make life a bit fairer for those poor defenceless NPCs, so don't expect me to do it soon.

Advice if you want to DIY: make sure they spawn a few metres above the surface as ships in contact with the surface will be removed.

[wiki]Trails[/wiki] show that you should not use too much flashers else you must buy a new computer or accept low FPS.

Another way is using shaders, there is an interesting example in [wiki]Flying Dutchman OXP[/wiki] which can make transparent models. In this case you must check oolite.gameSettings.detailLevel and spawn only if shaders or extras are set.

I noticed that Griff's station has that kind of feature: on can see the station's lights on the dark side. Can it ported to the planetary textures?

Unfortunately not. Ships and stations have had lighting since Oolite v1.74 depending on the OXPs used, but these are generated by shaders or emission maps applied to the models. Planets don't work in the same way, mostly being procedurally generated and although they can have textures applied to them the facility to add emissions is not yet possible.

_________________Commander Smivs, the friendliest Gourd this side of Riedquat.